git.sesse.net Git - vlc/blob - src/video_output/video_output.c

   1 /*****************************************************************************
   2  * video_output.c : video output thread
   3  * This module describes the programming interface for video output threads.
   4  * It includes functions allowing to open a new thread, send pictures to a
   5  * thread, and destroy a previously oppened video output thread.
   6  *****************************************************************************
   7  * Copyright (C) 2000-2001 VideoLAN
   8  * $Id: video_output.c,v 1.182 2002/06/01 18:04:49 sam Exp $
   9  *
  10  * Authors: Vincent Seguin <seguin@via.ecp.fr>
  11  *
  12  * This program is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License as published by
  14  * the Free Software Foundation; either version 2 of the License, or
  15  * (at your option) any later version.
  16  *
  17  * This program is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with this program; if not, write to the Free Software
  24  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
  25  *****************************************************************************/
  26
  27 /*****************************************************************************
  28  * Preamble
  29  *****************************************************************************/
  30 #include <errno.h>                                                 /* ENOMEM */
  31 #include <stdlib.h>                                                /* free() */
  32 #include <stdio.h>                                              /* sprintf() */
  33 #include <string.h>                                            /* strerror() */
  34
  35 #include <vlc/vlc.h>
  36
  37 #ifdef HAVE_SYS_TIMES_H
  38 #   include <sys/times.h>
  39 #endif
  40
  41 #include "video.h"
  42 #include "video_output.h"
  43
  44 /*****************************************************************************
  45  * Local prototypes
  46  *****************************************************************************/
  47 static int      InitThread        ( vout_thread_t * );
  48 static void     RunThread         ( vout_thread_t * );
  49 static void     ErrorThread       ( vout_thread_t * );
  50 static void     EndThread         ( vout_thread_t * );
  51 static void     DestroyThread     ( vout_thread_t * );
  52
  53 static int      ReduceHeight      ( int );
  54 static int      BinaryLog         ( u32 );
  55 static void     MaskToShift       ( int *, int *, u32 );
  56 static void     InitWindowSize    ( vout_thread_t *, int *, int * );
  57
  58 /*****************************************************************************
  59  * vout_CreateThread: creates a new video output thread
  60  *****************************************************************************
  61  * This function creates a new video output thread, and returns a pointer
  62  * to its description. On error, it returns NULL.
  63  *****************************************************************************/
  64 vout_thread_t * __vout_CreateThread ( vlc_object_t *p_parent,
  65                                       int i_width, int i_height,
  66                                       u32 i_chroma, int i_aspect )
  67 {
  68     vout_thread_t * p_vout;                             /* thread descriptor */
  69     int             i_index;                                /* loop variable */
  70     char          * psz_plugin;
  71
  72     /* Allocate descriptor */
  73     p_vout = vlc_object_create( p_parent, VLC_OBJECT_VOUT );
  74     if( p_vout == NULL )
  75     {
  76         msg_Err( p_parent, "out of memory" );
  77         return( NULL );
  78     }
  79
  80     /* Choose the best module */
  81     if( !(psz_plugin = config_GetPsz( p_vout, "filter" )) )
  82     {
  83         psz_plugin = config_GetPsz( p_vout, "vout" );
  84     }
  85
  86     /* Initialize pictures and subpictures - translation tables and functions
  87      * will be initialized later in InitThread */
  88     for( i_index = 0; i_index < 2 * VOUT_MAX_PICTURES; i_index++)
  89     {
  90         p_vout->p_picture[i_index].i_status = FREE_PICTURE;
  91         p_vout->p_picture[i_index].i_type   = EMPTY_PICTURE;
  92     }
  93
  94     for( i_index = 0; i_index < VOUT_MAX_SUBPICTURES; i_index++)
  95     {
  96         p_vout->p_subpicture[i_index].i_status = FREE_SUBPICTURE;
  97         p_vout->p_subpicture[i_index].i_type   = EMPTY_SUBPICTURE;
  98     }
  99
 100     /* No images in the heap */
 101     p_vout->i_heap_size = 0;
 102
 103     /* Initialize the rendering heap */
 104     I_RENDERPICTURES = 0;
 105     p_vout->render.i_width    = i_width;
 106     p_vout->render.i_height   = i_height;
 107     p_vout->render.i_chroma   = i_chroma;
 108     p_vout->render.i_aspect   = i_aspect;
 109
 110     p_vout->render.i_rmask    = 0;
 111     p_vout->render.i_gmask    = 0;
 112     p_vout->render.i_bmask    = 0;
 113
 114     /* Zero the output heap */
 115     I_OUTPUTPICTURES = 0;
 116     p_vout->output.i_width    = 0;
 117     p_vout->output.i_height   = 0;
 118     p_vout->output.i_chroma   = 0;
 119     p_vout->output.i_aspect   = 0;
 120
 121     p_vout->output.i_rmask    = 0;
 122     p_vout->output.i_gmask    = 0;
 123     p_vout->output.i_bmask    = 0;
 124
 125     /* Initialize misc stuff */
 126     p_vout->i_changes    = 0;
 127     p_vout->f_gamma      = 0;
 128     p_vout->b_grayscale  = 0;
 129     p_vout->b_info       = 0;
 130     p_vout->b_interface  = 0;
 131     p_vout->b_scale      = 1;
 132     p_vout->b_fullscreen = 0;
 133     p_vout->render_time  = 10;
 134     p_vout->c_fps_samples= 0;
 135
 136     /* user requested fullscreen? */
 137     if( config_GetInt( p_vout, "fullscreen" ) )
 138     {
 139         p_vout->i_changes |= VOUT_FULLSCREEN_CHANGE;
 140     }
 141
 142     /* Initialize the dimensions of the video window */
 143     InitWindowSize( p_vout, &p_vout->i_window_width,
 144                     &p_vout->i_window_height );
 145
 146
 147     p_vout->p_module = module_Need( p_vout, MODULE_CAPABILITY_VOUT,
 148                                     psz_plugin, (void *)p_vout );
 149
 150     if( psz_plugin ) free( psz_plugin );
 151     if( p_vout->p_module == NULL )
 152     {
 153         msg_Err( p_vout, "no suitable vout module" );
 154         vlc_object_destroy( p_vout );
 155         return( NULL );
 156     }
 157
 158 #define f p_vout->p_module->p_functions->vout.functions.vout
 159     p_vout->pf_create     = f.pf_create;
 160     p_vout->pf_init       = f.pf_init;
 161     p_vout->pf_end        = f.pf_end;
 162     p_vout->pf_destroy    = f.pf_destroy;
 163     p_vout->pf_manage     = f.pf_manage;
 164     p_vout->pf_render     = f.pf_render;
 165     p_vout->pf_display    = f.pf_display;
 166 #undef f
 167
 168     /* Create thread and set locks */
 169     vlc_mutex_init( p_vout, &p_vout->picture_lock );
 170     vlc_mutex_init( p_vout, &p_vout->subpicture_lock );
 171     vlc_mutex_init( p_vout, &p_vout->change_lock );
 172
 173     vlc_object_attach( p_vout, p_parent );
 174
 175     if( vlc_thread_create( p_vout, "video output", RunThread, 0 ) )
 176     {
 177         msg_Err( p_vout, "%s", strerror(ENOMEM) );
 178         p_vout->pf_destroy( p_vout );
 179         module_Unneed( p_vout->p_module );
 180         vlc_object_destroy( p_vout );
 181         return NULL;
 182     }
 183
 184     return p_vout;
 185 }
 186
 187 /*****************************************************************************
 188  * vout_DestroyThread: destroys a previously created thread
 189  *****************************************************************************
 190  * Destroy a terminated thread.
 191  * The function will request a destruction of the specified thread. If pi_error
 192  * is NULL, it will return once the thread is destroyed. Else, it will be
 193  * update using one of the THREAD_* constants.
 194  *****************************************************************************/
 195 void vout_DestroyThread( vout_thread_t *p_vout )
 196 {
 197     /* Unlink object */
 198     vlc_object_unlink_all( p_vout );
 199
 200     /* Request thread destruction */
 201     p_vout->b_die = 1;
 202     vlc_thread_join( p_vout );
 203
 204     /* Free structure */
 205     vlc_object_destroy( p_vout );
 206 }
 207
 208 /*****************************************************************************
 209  * vout_ChromaCmp: compare two chroma values
 210  *****************************************************************************
 211  * This function returns 1 if the two fourcc values given as argument are
 212  * the same format (eg. UYVY / UYNV) or almost the same format (eg. I420/YV12)
 213  *****************************************************************************/
 214 int vout_ChromaCmp( u32 i_chroma, u32 i_amorhc )
 215 {
 216     /* If they are the same, they are the same ! */
 217     if( i_chroma == i_amorhc )
 218     {
 219         return 1;
 220     }
 221
 222     /* Check for equivalence classes */
 223     switch( i_chroma )
 224     {
 225         case FOURCC_I420:
 226         case FOURCC_IYUV:
 227         case FOURCC_YV12:
 228             switch( i_amorhc )
 229             {
 230                 case FOURCC_I420:
 231                 case FOURCC_IYUV:
 232                 case FOURCC_YV12:
 233                     return 1;
 234
 235                 default:
 236                     return 0;
 237             }
 238
 239         case FOURCC_UYVY:
 240         case FOURCC_UYNV:
 241         case FOURCC_Y422:
 242             switch( i_amorhc )
 243             {
 244                 case FOURCC_UYVY:
 245                 case FOURCC_UYNV:
 246                 case FOURCC_Y422:
 247                     return 1;
 248
 249                 default:
 250                     return 0;
 251             }
 252
 253         case FOURCC_YUY2:
 254         case FOURCC_YUNV:
 255             switch( i_amorhc )
 256             {
 257                 case FOURCC_YUY2:
 258                 case FOURCC_YUNV:
 259                     return 1;
 260
 261                 default:
 262                     return 0;
 263             }
 264
 265         default:
 266             return 0;
 267     }
 268 }
 269
 270 /*****************************************************************************
 271  * InitThread: initialize video output thread
 272  *****************************************************************************
 273  * This function is called from RunThread and performs the second step of the
 274  * initialization. It returns 0 on success. Note that the thread's flag are not
 275  * modified inside this function.
 276  *****************************************************************************/
 277 static int InitThread( vout_thread_t *p_vout )
 278 {
 279     int i, i_pgcd;
 280
 281     vlc_mutex_lock( &p_vout->change_lock );
 282
 283 #ifdef STATS
 284     p_vout->c_loops = 0;
 285 #endif
 286
 287     /* Initialize output method, it allocates direct buffers for us */
 288     if( p_vout->pf_init( p_vout ) )
 289     {
 290         vlc_mutex_unlock( &p_vout->change_lock );
 291         return( 1 );
 292     }
 293
 294     if( !I_OUTPUTPICTURES )
 295     {
 296         msg_Err( p_vout, "plugin was unable to allocate at least "
 297                          "one direct buffer" );
 298         p_vout->pf_end( p_vout );
 299         vlc_mutex_unlock( &p_vout->change_lock );
 300         return( 1 );
 301     }
 302
 303     msg_Dbg( p_vout, "got %i direct buffer(s)", I_OUTPUTPICTURES );
 304
 305     i_pgcd = ReduceHeight( p_vout->render.i_aspect );
 306     msg_Dbg( p_vout,
 307              "picture in %ix%i, chroma 0x%.8x (%4.4s), aspect ratio %i:%i",
 308              p_vout->render.i_width, p_vout->render.i_height,
 309              p_vout->render.i_chroma, (char*)&p_vout->render.i_chroma,
 310              p_vout->render.i_aspect / i_pgcd, VOUT_ASPECT_FACTOR / i_pgcd );
 311
 312     i_pgcd = ReduceHeight( p_vout->output.i_aspect );
 313     msg_Dbg( p_vout,
 314              "picture out %ix%i, chroma 0x%.8x (%4.4s), aspect ratio %i:%i",
 315              p_vout->output.i_width, p_vout->output.i_height,
 316              p_vout->output.i_chroma, (char*)&p_vout->output.i_chroma,
 317              p_vout->output.i_aspect / i_pgcd, VOUT_ASPECT_FACTOR / i_pgcd );
 318
 319     /* Calculate shifts from system-updated masks */
 320     MaskToShift( &p_vout->output.i_lrshift, &p_vout->output.i_rrshift,
 321                  p_vout->output.i_rmask );
 322     MaskToShift( &p_vout->output.i_lgshift, &p_vout->output.i_rgshift,
 323                  p_vout->output.i_gmask );
 324     MaskToShift( &p_vout->output.i_lbshift, &p_vout->output.i_rbshift,
 325                  p_vout->output.i_bmask );
 326
 327     /* Check whether we managed to create direct buffers similar to
 328      * the render buffers, ie same size, chroma and aspect ratio */
 329     if( ( p_vout->output.i_width == p_vout->render.i_width )
 330      && ( p_vout->output.i_height == p_vout->render.i_height )
 331      && ( vout_ChromaCmp( p_vout->output.i_chroma, p_vout->render.i_chroma ) )
 332      && ( p_vout->output.i_aspect == p_vout->render.i_aspect ) )
 333     {
 334         /* Cool ! We have direct buffers, we can ask the decoder to
 335          * directly decode into them ! Map the first render buffers to
 336          * the first direct buffers, but keep the first direct buffer
 337          * for memcpy operations */
 338         p_vout->b_direct = 1;
 339
 340         msg_Dbg( p_vout, "direct render, mapping "
 341                  "render pictures 0-%i to system pictures 1-%i",
 342                  VOUT_MAX_PICTURES - 2, VOUT_MAX_PICTURES - 1 );
 343
 344         for( i = 1; i < VOUT_MAX_PICTURES; i++ )
 345         {
 346             PP_RENDERPICTURE[ I_RENDERPICTURES ] = &p_vout->p_picture[ i ];
 347             I_RENDERPICTURES++;
 348         }
 349     }
 350     else
 351     {
 352         /* Rats... Something is wrong here, we could not find an output
 353          * plugin able to directly render what we decode. See if we can
 354          * find a chroma plugin to do the conversion */
 355         p_vout->b_direct = 0;
 356
 357         /* Choose the best module */
 358         p_vout->chroma.p_module =
 359             module_Need( p_vout, MODULE_CAPABILITY_CHROMA,
 360                          NULL, (void *)p_vout );
 361
 362         if( p_vout->chroma.p_module == NULL )
 363         {
 364             msg_Err( p_vout, "no chroma module for %4.4s to %4.4s",
 365                      &p_vout->render.i_chroma, &p_vout->output.i_chroma );
 366             p_vout->pf_end( p_vout );
 367             vlc_mutex_unlock( &p_vout->change_lock );
 368             return( 1 );
 369         }
 370
 371 #define f p_vout->chroma.p_module->p_functions->chroma.functions.chroma
 372         p_vout->chroma.pf_init       = f.pf_init;
 373         p_vout->chroma.pf_end        = f.pf_end;
 374 #undef f
 375
 376         if( I_OUTPUTPICTURES < 2 * VOUT_MAX_PICTURES )
 377         {
 378             msg_Dbg( p_vout, "indirect render, mapping "
 379                      "render pictures %i-%i to system pictures %i-%i",
 380                      I_OUTPUTPICTURES - 1, 2 * VOUT_MAX_PICTURES - 2,
 381                      I_OUTPUTPICTURES, 2 * VOUT_MAX_PICTURES - 1 );
 382         }
 383         else
 384         {
 385             /* FIXME: if this happens, we don't have any render pictures left */
 386             msg_Dbg( p_vout, "indirect render, no system pictures needed,"
 387                      " we have %i directbuffers", I_OUTPUTPICTURES );
 388             msg_Err( p_vout, "this is a bug!" );
 389         }
 390
 391         /* Append render buffers after the direct buffers */
 392         for( i = I_OUTPUTPICTURES; i < 2 * VOUT_MAX_PICTURES; i++ )
 393         {
 394             PP_RENDERPICTURE[ I_RENDERPICTURES ] = &p_vout->p_picture[ i ];
 395             I_RENDERPICTURES++;
 396         }
 397     }
 398
 399     /* Link pictures back to their heap */
 400     for( i = 0 ; i < I_RENDERPICTURES ; i++ )
 401     {
 402         PP_RENDERPICTURE[ i ]->p_heap = &p_vout->render;
 403     }
 404
 405     for( i = 0 ; i < I_OUTPUTPICTURES ; i++ )
 406     {
 407         PP_OUTPUTPICTURE[ i ]->p_heap = &p_vout->output;
 408     }
 409
 410 /* XXX XXX mark thread ready */
 411     return( 0 );
 412 }
 413
 414 /*****************************************************************************
 415  * RunThread: video output thread
 416  *****************************************************************************
 417  * Video output thread. This function does only returns when the thread is
 418  * terminated. It handles the pictures arriving in the video heap and the
 419  * display device events.
 420  *****************************************************************************/
 421 static void RunThread( vout_thread_t *p_vout)
 422 {
 423     int             i_index;                                /* index in heap */
 424     int             i_idle_loops = 0;  /* loops without displaying a picture */
 425     mtime_t         current_date;                            /* current date */
 426     mtime_t         display_date;                            /* display date */
 427
 428     picture_t *     p_picture;                            /* picture pointer */
 429     picture_t *     p_last_picture = NULL;                   /* last picture */
 430     picture_t *     p_directbuffer;              /* direct buffer to display */
 431
 432     subpicture_t *  p_subpic;                          /* subpicture pointer */
 433
 434     /*
 435      * Initialize thread
 436      */
 437     p_vout->b_error = InitThread( p_vout );
 438     if( p_vout->b_error )
 439     {
 440         /* Destroy thread structures allocated by Create and InitThread */
 441         p_vout->pf_destroy( p_vout );
 442
 443         DestroyThread( p_vout );
 444         return;
 445     }
 446
 447     /*
 448      * Main loop - it is not executed if an error occured during
 449      * initialization
 450      */
 451     while( (!p_vout->b_die) && (!p_vout->b_error) )
 452     {
 453         /* Initialize loop variables */
 454         display_date = 0;
 455         current_date = mdate();
 456
 457 #ifdef STATS
 458         p_vout->c_loops++;
 459         if( !(p_vout->c_loops % VOUT_STATS_NB_LOOPS) )
 460         {
 461             msg_Dbg( p_vout, "picture heap: %d/%d",
 462                      I_RENDERPICTURES, p_vout->i_heap_size );
 463         }
 464 #endif
 465
 466         /*
 467          * Find the picture to display - this operation does not need lock,
 468          * since only READY_PICTUREs are handled
 469          */
 470         p_picture = NULL;
 471
 472         for( i_index = 0; i_index < I_RENDERPICTURES; i_index++ )
 473         {
 474             if( (PP_RENDERPICTURE[i_index]->i_status == READY_PICTURE)
 475                 && ( (p_picture == NULL) ||
 476                      (PP_RENDERPICTURE[i_index]->date < display_date) ) )
 477             {
 478                 p_picture = PP_RENDERPICTURE[i_index];
 479                 display_date = p_picture->date;
 480             }
 481         }
 482
 483         if( p_picture != NULL )
 484         {
 485             /* If we met the last picture, parse again to see whether there is
 486              * a more appropriate one. */
 487             if( p_picture == p_last_picture )
 488             {
 489                 for( i_index = 0; i_index < I_RENDERPICTURES; i_index++ )
 490                 {
 491                     if( (PP_RENDERPICTURE[i_index]->i_status == READY_PICTURE)
 492                         && (PP_RENDERPICTURE[i_index] != p_last_picture)
 493                         && ((p_picture == p_last_picture) ||
 494                             (PP_RENDERPICTURE[i_index]->date < display_date)) )
 495                     {
 496                         p_picture = PP_RENDERPICTURE[i_index];
 497                         display_date = p_picture->date;
 498                     }
 499                 }
 500             }
 501
 502             /* If we found better than the last picture, destroy it */
 503             if( p_last_picture && p_picture != p_last_picture )
 504             {
 505                 vlc_mutex_lock( &p_vout->picture_lock );
 506                 if( p_last_picture->i_refcount )
 507                 {
 508                     p_last_picture->i_status = DISPLAYED_PICTURE;
 509                 }
 510                 else
 511                 {
 512                     p_last_picture->i_status = DESTROYED_PICTURE;
 513                     p_vout->i_heap_size--;
 514                 }
 515                 vlc_mutex_unlock( &p_vout->picture_lock );
 516             }
 517
 518             /* Compute FPS rate */
 519             p_vout->p_fps_sample[ p_vout->c_fps_samples++ % VOUT_FPS_SAMPLES ]
 520                 = display_date;
 521
 522             if( !p_picture->b_force &&
 523                 p_picture != p_last_picture &&
 524                 display_date < current_date + p_vout->render_time )
 525             {
 526                 /* Picture is late: it will be destroyed and the thread
 527                  * will directly choose the next picture */
 528                 vlc_mutex_lock( &p_vout->picture_lock );
 529                 if( p_picture->i_refcount )
 530                 {
 531                     /* Pretend we displayed the picture, but don't destroy
 532                      * it since the decoder might still need it. */
 533                     p_picture->i_status = DISPLAYED_PICTURE;
 534                 }
 535                 else
 536                 {
 537                     /* Destroy the picture without displaying it */
 538                     p_picture->i_status = DESTROYED_PICTURE;
 539                     p_vout->i_heap_size--;
 540                 }
 541                 msg_Warn( p_vout, "late picture skipped (%lld)",
 542                                   current_date - display_date );
 543                 vlc_mutex_unlock( &p_vout->picture_lock );
 544
 545                 continue;
 546             }
 547 #if 0
 548             /* Removed because it causes problems for some people --Meuuh */
 549             if( display_date > current_date + VOUT_BOGUS_DELAY )
 550             {
 551                 /* Picture is waaay too early: it will be destroyed */
 552                 vlc_mutex_lock( &p_vout->picture_lock );
 553                 if( p_picture->i_refcount )
 554                 {
 555                     /* Pretend we displayed the picture, but don't destroy
 556                      * it since the decoder might still need it. */
 557                     p_picture->i_status = DISPLAYED_PICTURE;
 558                 }
 559                 else
 560                 {
 561                     /* Destroy the picture without displaying it */
 562                     p_picture->i_status = DESTROYED_PICTURE;
 563                     p_vout->i_heap_size--;
 564                 }
 565                 intf_WarnMsg( 1, "vout warning: early picture skipped (%lld)",
 566                               display_date - current_date );
 567                 vlc_mutex_unlock( &p_vout->picture_lock );
 568
 569                 continue;
 570             }
 571 #endif
 572             if( display_date > current_date + VOUT_DISPLAY_DELAY )
 573             {
 574                 /* A picture is ready to be rendered, but its rendering date
 575                  * is far from the current one so the thread will perform an
 576                  * empty loop as if no picture were found. The picture state
 577                  * is unchanged */
 578                 p_picture    = NULL;
 579                 display_date = 0;
 580             }
 581             else if( p_picture == p_last_picture )
 582             {
 583                 /* We are asked to repeat the previous picture, but we first
 584                  * wait for a couple of idle loops */
 585                 if( i_idle_loops < 4 )
 586                 {
 587                     p_picture    = NULL;
 588                     display_date = 0;
 589                 }
 590                 else
 591                 {
 592                     //intf_WarnMsg( 6, "vout info: duplicating picture" );
 593                 }
 594             }
 595         }
 596
 597         if( p_picture == NULL )
 598         {
 599             i_idle_loops++;
 600         }
 601
 602         /*
 603          * Check for subpictures to display
 604          */
 605         p_subpic = vout_SortSubPictures( p_vout, display_date );
 606
 607         /*
 608          * Perform rendering
 609          */
 610         p_directbuffer = vout_RenderPicture( p_vout, p_picture, p_subpic );
 611
 612         /*
 613          * Call the plugin-specific rendering method
 614          */
 615         if( p_picture != NULL )
 616         {
 617             /* Render the direct buffer returned by vout_RenderPicture */
 618             p_vout->pf_render( p_vout, p_directbuffer );
 619         }
 620
 621         /*
 622          * Sleep, wake up
 623          */
 624         if( display_date != 0 )
 625         {
 626             /* Store render time using Bresenham algorithm */
 627             p_vout->render_time += mdate() - current_date;
 628             p_vout->render_time >>= 1;
 629         }
 630
 631         /* Give back change lock */
 632         vlc_mutex_unlock( &p_vout->change_lock );
 633
 634         /* Sleep a while or until a given date */
 635         if( display_date != 0 )
 636         {
 637             mwait( display_date - VOUT_MWAIT_TOLERANCE );
 638         }
 639         else
 640         {
 641             msleep( VOUT_IDLE_SLEEP );
 642         }
 643
 644         /* On awakening, take back lock and send immediately picture
 645          * to display. */
 646         vlc_mutex_lock( &p_vout->change_lock );
 647
 648         /*
 649          * Display the previously rendered picture
 650          */
 651         if( p_picture != NULL )
 652         {
 653             /* Display the direct buffer returned by vout_RenderPicture */
 654             p_vout->pf_display( p_vout, p_directbuffer );
 655
 656             /* Reinitialize idle loop count */
 657             i_idle_loops = 0;
 658
 659             /* Tell the vout this was the last picture and that it does not
 660              * need to be forced anymore. */
 661             p_last_picture = p_picture;
 662             p_last_picture->b_force = 0;
 663         }
 664
 665         /*
 666          * Check events and manage thread
 667          */
 668         if( p_vout->pf_manage( p_vout ) )
 669         {
 670             /* A fatal error occured, and the thread must terminate
 671              * immediately, without displaying anything - setting b_error to 1
 672              * causes the immediate end of the main while() loop. */
 673             p_vout->b_error = 1;
 674         }
 675
 676         if( p_vout->i_changes & VOUT_SIZE_CHANGE )
 677         {
 678             /* this must only happen when the vout plugin is incapable of
 679              * rescaling the picture itself. In this case we need to destroy
 680              * the current picture buffers and recreate new ones with the right
 681              * dimensions */
 682             int i;
 683
 684             p_vout->i_changes &= ~VOUT_SIZE_CHANGE;
 685
 686             p_vout->pf_end( p_vout );
 687             for( i = 0; i < I_OUTPUTPICTURES; i++ )
 688                  p_vout->p_picture[ i ].i_status = FREE_PICTURE;
 689
 690             I_OUTPUTPICTURES = 0;
 691             if( p_vout->pf_init( p_vout ) )
 692             {
 693                 msg_Err( p_vout, "cannot resize display" );
 694                 /* FixMe: p_vout->pf_end will be called again in EndThread() */
 695                 p_vout->b_error = 1;
 696             }
 697
 698             /* Need to reinitialise the chroma plugin */
 699             p_vout->chroma.pf_end( p_vout );
 700             p_vout->chroma.pf_init( p_vout );
 701         }
 702
 703     }
 704
 705     /*
 706      * Error loop - wait until the thread destruction is requested
 707      */
 708     if( p_vout->b_error )
 709     {
 710         ErrorThread( p_vout );
 711     }
 712
 713     /* End of thread */
 714     EndThread( p_vout );
 715
 716     /* Destroy method-dependant resources */
 717     p_vout->pf_destroy( p_vout );
 718
 719     /* Destroy thread structures allocated by CreateThread */
 720     DestroyThread( p_vout );
 721 }
 722
 723 /*****************************************************************************
 724  * ErrorThread: RunThread() error loop
 725  *****************************************************************************
 726  * This function is called when an error occured during thread main's loop. The
 727  * thread can still receive feed, but must be ready to terminate as soon as
 728  * possible.
 729  *****************************************************************************/
 730 static void ErrorThread( vout_thread_t *p_vout )
 731 {
 732     /* Wait until a `die' order */
 733     while( !p_vout->b_die )
 734     {
 735         /* Sleep a while */
 736         msleep( VOUT_IDLE_SLEEP );
 737     }
 738 }
 739
 740 /*****************************************************************************
 741  * EndThread: thread destruction
 742  *****************************************************************************
 743  * This function is called when the thread ends after a sucessful
 744  * initialization. It frees all ressources allocated by InitThread.
 745  *****************************************************************************/
 746 static void EndThread( vout_thread_t *p_vout )
 747 {
 748     int     i_index;                                        /* index in heap */
 749
 750 #ifdef STATS
 751     {
 752         struct tms cpu_usage;
 753         times( &cpu_usage );
 754
 755         msg_Dbg( p_vout, "cpu usage (user: %d, system: %d)",
 756                  cpu_usage.tms_utime, cpu_usage.tms_stime );
 757     }
 758 #endif
 759
 760     if( !p_vout->b_direct )
 761     {
 762         p_vout->chroma.pf_end( p_vout );
 763         module_Unneed( p_vout->chroma.p_module );
 764     }
 765
 766     /* Destroy all remaining pictures */
 767     for( i_index = 0; i_index < 2 * VOUT_MAX_PICTURES; i_index++ )
 768     {
 769         if ( p_vout->p_picture[i_index].i_type == MEMORY_PICTURE )
 770         {
 771             free( p_vout->p_picture[i_index].p_data_orig );
 772         }
 773     }
 774
 775     /* Destroy all remaining subpictures */
 776     for( i_index = 0; i_index < VOUT_MAX_SUBPICTURES; i_index++ )
 777     {
 778         if( p_vout->p_subpicture[i_index].i_status != FREE_SUBPICTURE )
 779         {
 780             free( p_vout->p_subpicture[i_index].p_sys );
 781         }
 782     }
 783
 784     /* Destroy translation tables */
 785     p_vout->pf_end( p_vout );
 786
 787     /* Release the change lock */
 788     vlc_mutex_unlock( &p_vout->change_lock );
 789 }
 790
 791 /*****************************************************************************
 792  * DestroyThread: thread destruction
 793  *****************************************************************************
 794  * This function is called when the thread ends. It frees all ressources
 795  * allocated by CreateThread. Status is available at this stage.
 796  *****************************************************************************/
 797 static void DestroyThread( vout_thread_t *p_vout )
 798 {
 799     /* Destroy the locks */
 800     vlc_mutex_destroy( &p_vout->picture_lock );
 801     vlc_mutex_destroy( &p_vout->subpicture_lock );
 802     vlc_mutex_destroy( &p_vout->change_lock );
 803
 804     /* Release the module */
 805     module_Unneed( p_vout->p_module );
 806 }
 807
 808 /* following functions are local */
 809
 810 static int ReduceHeight( int i_ratio )
 811 {
 812     int i_dummy = VOUT_ASPECT_FACTOR;
 813     int i_pgcd  = 1;
 814
 815     if( !i_ratio )
 816     {
 817         return i_pgcd;
 818     }
 819
 820     /* VOUT_ASPECT_FACTOR is (2^7 * 3^3 * 5^3), we just check for 2, 3 and 5 */
 821     while( !(i_ratio & 1) && !(i_dummy & 1) )
 822     {
 823         i_ratio >>= 1;
 824         i_dummy >>= 1;
 825         i_pgcd  <<= 1;
 826     }
 827
 828     while( !(i_ratio % 3) && !(i_dummy % 3) )
 829     {
 830         i_ratio /= 3;
 831         i_dummy /= 3;
 832         i_pgcd  *= 3;
 833     }
 834
 835     while( !(i_ratio % 5) && !(i_dummy % 5) )
 836     {
 837         i_ratio /= 5;
 838         i_dummy /= 5;
 839         i_pgcd  *= 5;
 840     }
 841
 842     return i_pgcd;
 843 }
 844
 845 /*****************************************************************************
 846  * BinaryLog: computes the base 2 log of a binary value
 847  *****************************************************************************
 848  * This functions is used by MaskToShift, to get a bit index from a binary
 849  * value.
 850  *****************************************************************************/
 851 static int BinaryLog(u32 i)
 852 {
 853     int i_log = 0;
 854
 855     if( i == 0 ) return -31337;
 856
 857     if( i & 0xffff0000 ) i_log += 16;
 858     if( i & 0xff00ff00 ) i_log += 8;
 859     if( i & 0xf0f0f0f0 ) i_log += 4;
 860     if( i & 0xcccccccc ) i_log += 2;
 861     if( i & 0xaaaaaaaa ) i_log += 1;
 862
 863     return( i_log );
 864 }
 865
 866 /*****************************************************************************
 867  * MaskToShift: transform a color mask into right and left shifts
 868  *****************************************************************************
 869  * This function is used for obtaining color shifts from masks.
 870  *****************************************************************************/
 871 static void MaskToShift( int *pi_left, int *pi_right, u32 i_mask )
 872 {
 873     u32 i_low, i_high;                 /* lower hand higher bits of the mask */
 874
 875     if( !i_mask )
 876     {
 877         *pi_left = *pi_right = 0;
 878         return;
 879     }
 880
 881     /* Get bits */
 882     i_low =  i_mask & (- i_mask);                   /* lower bit of the mask */
 883     i_high = i_mask + i_low;                       /* higher bit of the mask */
 884
 885     /* Transform bits into an index */
 886     i_low =  BinaryLog (i_low);
 887     i_high = BinaryLog (i_high);
 888
 889     /* Update pointers and return */
 890     *pi_left =   i_low;
 891     *pi_right = (8 - i_high + i_low);
 892 }
 893
 894 /*****************************************************************************
 895  * InitWindowSize: find the initial dimensions the video window should have.
 896  *****************************************************************************
 897  * This function will check the "width", "height" and "zoom" config options and
 898  * will calculate the size that the video window should have.
 899  *****************************************************************************/
 900 static void InitWindowSize( vout_thread_t *p_vout, int *pi_width,
 901                             int *pi_height )
 902 {
 903     int i_width, i_height;
 904     double f_zoom;
 905
 906     i_width = config_GetInt( p_vout, "width" );
 907     i_height = config_GetInt( p_vout, "height" );
 908     f_zoom = config_GetFloat( p_vout, "zoom" );
 909
 910     if( (i_width >= 0) && (i_height >= 0))
 911     {
 912         *pi_width = i_width * f_zoom;
 913         *pi_height = i_height * f_zoom;
 914         return;
 915     }
 916     else if( i_width >= 0 )
 917     {
 918         *pi_width = i_width * f_zoom;
 919         *pi_height = i_width * f_zoom * VOUT_ASPECT_FACTOR /
 920                         p_vout->render.i_aspect;
 921         return;
 922     }
 923     else if( i_height >= 0 )
 924     {
 925         *pi_height = i_height * f_zoom;
 926         *pi_width = i_height * f_zoom * p_vout->render.i_aspect /
 927                        VOUT_ASPECT_FACTOR;
 928         return;
 929     }
 930
 931     if( p_vout->render.i_height * p_vout->render.i_aspect
 932         >= p_vout->render.i_width * VOUT_ASPECT_FACTOR )
 933     {
 934         *pi_width = p_vout->render.i_height * f_zoom
 935           * p_vout->render.i_aspect / VOUT_ASPECT_FACTOR;
 936         *pi_height = p_vout->render.i_height * f_zoom;
 937     }
 938     else
 939     {
 940         *pi_width = p_vout->render.i_width * f_zoom;
 941         *pi_height = p_vout->render.i_width * f_zoom
 942           * VOUT_ASPECT_FACTOR / p_vout->render.i_aspect;
 943     }
 944 }